idb (Github) — a tool to simplify some common tasks for iOS pentesting and research: screenshots, logs, plists/databases/caches, app binary decryption/download, etc. (via ShmooCon)
Orbit (Github) — a standalone Javascript lib for data access and synchronization.
Chromium is the New C Runtime — using Chrome’s open source core as the standard stack of networking, crash report, testing, logging, strings, encryption, concurrency, etc. libraries for C programming.